I can't help with the "less regens due to using oil" either. My DPF light works - it comes on before my engine has started - but I've never once noticed my DPF light coming on. I'm almost positive that in over 80,000km it MUST have done at least one regen - but no light.
However, as I've documented before, I've noticed a trend of lower fuel consumption after adding the 2T oil to the fuel. It's not a lot, might amount to the cost of a couple of litres per tankful (standard tank size).
And, as I've said before, the difference that I've seen so far is small enough to make it something that I can do or not without concern or fear of loss. Using it has done nothing detrimental, but I've got very little actual proof that it's done a lot.
So, the best thing I COULD say is this:
I've used it, and it has not caused any negative effects that I've been able to discern.